<form style="margin:0px;" action="{$sUrl}" method="post">
<input type="hidden" name="act" value="jump_to_forum" />
<select name="id" onchange="submit();" style="width:150px;">
    <option value="">{language text="jump_to_forum"}</option>
    {if pluginInstalled('vbulletin')}
    {html_options options=$aForumJumpList}
    {else}
    {section name=I loop=$aForumJumpList}
    <option value="{$aForumJumpList[I].forum_id}">{language translate=$aForumJumpList[I].forum_title}</option>
    {/section}
    {/if}
</select>
</form>